Surveying
The scale of the photography taken from a height of 300 m, with a camera of focal length 15 cm, is

1 : 15,000
1 : 10,000
1 : 20,000
1 : 30,000

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Surveying
The rise and fall method

is less accurate than height of instrument method
is not suitable for levelling with tilting levels
provides a check on the reduction of intermediate point levels
quicker and less tedious for large number of intermediate sights

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